What is ca file? How to open ca files?

File extension ca is associated with the Telnet Server. The .ca file stores initial cache data used to establish telnet connections. Often used by operating systems with the terminal interface, like UNIX or Linux.

Telnet (Telecommunication network) is a network protocol used on the Internet or local area network (LAN) connections.

Updated: June 7, 2018

The default software associated to open ca file:

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS. MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Windows 10.

macOS is Unix-based desktop operating system, a successor of Mac OS X system for MacBook-family, iMac, Mac Mini and Mac Pro computers, developed and sold by Apple, Inc.

macOS High Sierra (10.13) is including various new features, like digital personal assistant called Siri, new Apple Pay service, iCloud drive, new Messages app, Apple File System a successor of HFS+ and many more.

The latest version 10.11 of OS X is called El Capitan. It is available to purchase on Mac App Store as well as is distributed with new Mac computers and notebooks. It includes features to improve the security, performance, design and usability.

A multi-tasking operating system for various platforms, the first version of UNIX was released in 1969. It is developed by AT&T as well as various commercial vendors, universities and non-profit organizations. Traditional Original Unix systems have characteristics of Version 7 Unix or UNIX System V. Unix Specification have Mac OS X, Mac OS X Server, Solaris, AIX, HP/UX, z/OS etc. Other systems, such as Linux and BSD are called Unix-like or Unix system-like.

Linux is family of Unix-based operating systems. Linux kernel supports variety of devices such as desktop computers, smart phones, tablet computers, routers, video game consoles etc. Linux is also leading operating system for servers. Linux is available for free in many distributions on the Internet.

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